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Detailed Study of Closed Stator Slots for a Direct-Driven Synchronous Permanent Magnet Linear Wave Energy Converter

Division for Electricity, Uppsala University Box 534, Uppsala 751 21, Sweden
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Machines 2014, 2(1), 73-86; https://doi.org/10.3390/machines2010073
Received: 3 December 2013 / Revised: 9 January 2014 / Accepted: 16 January 2014 / Published: 23 January 2014
(This article belongs to the Special Issue Advances in Machinery for Renewable Power Generation)
The aim of this paper is to analyze how a permanent magnet linear generator for wave power behaves when the stator slots are closed. The usual design of stator geometry is to use open slots to maintain a low magnetic leakage flux between the stator teeth. By doing this, harmonics are induced in the magnetic flux density in the air-gap due to slotting. The closed slots are designed to cause saturation, to keep the permeability low. This reduces the slot harmonics in the magnetic flux density, but will also increase the flux leakage between the stator teeth. An analytical model has been created to study the flux through the closed slots and the result compared with finite element simulations. The outcome shows a reduction of the cogging force and a reduction of the harmonics of the magnetic flux density in the air-gap. It also shows a small increase of the total magnetic flux entering the stator and an increased magnetic flux leakage through the closed slots. View Full-Text
Keywords: wave energy converter; permanent magnet; closed stator slots; magnetic flux wave energy converter; permanent magnet; closed stator slots; magnetic flux
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Lejerskog, E.; Leijon, M. Detailed Study of Closed Stator Slots for a Direct-Driven Synchronous Permanent Magnet Linear Wave Energy Converter. Machines 2014, 2, 73-86.

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